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    <!-- ## 1. 给一段文章中的全部指定词语进行过滤

   ```javascript
   // 比如我要过滤 "SM"
   
   var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd'
   
   // 需要结果
   // asdasd**asdasdasd**sdasdasd**
   ``` -->
   <script>
        var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd';
        var res=str.replace('SM','**')
        while(res.indexOf('SM')!==-1){
            res=res.replace('SM','**')
        }
        console.log(res);
   </script>
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